Sorry you are so unhappy, but there isn't a thing you can do about it. Prepare yourself to be bummed out for awhile, and forget about her. Move on. Keep away.

You know, I never can understand you "rescue-the-damsel-in-distress" types. What is it that appeals to you about this situation? Is it that on some level you get to feel "superior" to her? Are you insecure about your ability to attract an "undamaged" girl of higher quality? I do not say this to be unkind, but think about it: you only get one shot at life. Wouldn't you rather spend it with someone who doesn't need a lot of "fixing up"? We all come pretty much "as is" and it seems sad to try to force a fit with excessively needy people thinking we can "fix" them later.